CN112490067B - Switch - Google Patents
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- CN112490067B CN112490067B CN202011312898.8A CN202011312898A CN112490067B CN 112490067 B CN112490067 B CN 112490067B CN 202011312898 A CN202011312898 A CN 202011312898A CN 112490067 B CN112490067 B CN 112490067B
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- energy storage
- storage element
- switch
- circuit
- control switch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/28—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism
Abstract
The invention discloses a switch. The switch includes: the switching component is used for executing the opening action and the closing action of the circuit when the circuit works normally or breaks down; a drive mechanism including a drive coil for driving the operation of the switch assembly; and a control circuit. The control circuit in the switch controls the current flowing through the driving coil of the driving mechanism and the change rate thereof according to different operating conditions of the circuit, so that the switch assembly executes the opening and closing actions (opening and closing actions) of the circuit at the most appropriate speed, namely, the combination of the rapid opening and closing actions and the normal-speed opening and closing actions is realized. Because the number of rapid opening and closing actions is reduced, the probability of fatigue damage is reduced, and the service life and the safety of the switch are ensured.
Description
Technical Field
The invention relates to the field of electric power, in particular to a switch.
Background
With the rapid development of industrialization and urbanization in China, the power demand will continuously increase in a long period. The power grid development task is heavy, and the development of the intelligent power distribution network is more urgent. A new generation of high-reliability intelligent fast circuit breaker (or switch) is researched and developed, and powerful technical guarantee can be provided for the safety and reliability of power supply of the intelligent power distribution network.
Conventionally, in order to secure grid safety, a fault circuit is cut off, and a circuit breaker is generally used to break the fault circuit. However, the switching-off speed is slow, and a fault circuit is removed within 30-40 ms after an arc fault occurs, so that the switching equipment and the personal safety cannot be protected in time.
In recent years, the quick circuit breaker is also driven by an electromagnetic repulsion mechanism. The electromagnetic repulsion mechanism has simple structure, quick action and convenient electronic control, and can well meet the requirement of opening speed. However, the electromagnetic repulsion mechanism has high opening and closing movement speed and large impact force, and reduces the service life and the safety of the quick circuit breaker.
Disclosure of Invention
The invention aims to provide a switch, which can solve the problems of the reduction of the service life and the safety of a quick switch in the related art.
According to an aspect of the present invention, there is provided a switch comprising: the switching component is used for executing the switching-off action and the switching-on action of the circuit when the circuit works normally or fails; the driving mechanism comprises a driving coil and is used for driving the switch component to act; and a control circuit comprising: the fast energy storage element and the fast control switch are connected in series, and the fast energy storage element and the fast control switch are used for discharging the driving coil when the circuit is in failure so as to control the current flowing through the driving coil and the change rate of the current; the constant-speed energy storage element and the constant-speed control switch are connected in series, and in a second control branch which is connected with the first control branch in parallel, the constant-speed energy storage element and the constant-speed control switch are used for discharging the driving coil when the circuit works normally so as to control the current flowing through the driving coil and the change rate of the current; wherein the current and its rate of change when the circuit fails is greater than the current and its rate of change when the circuit is operating normally.
Preferably, the fast energy storage element is a first energy storage element C1, the fast control switch is a first control switch K1, and the first energy storage element C1 and the first control switch K1 are connected in series with the driving coil L; the constant-speed energy storage element is a second energy storage element C2, the constant-speed control switch is a second control switch K2, and the second energy storage element C2 and the second control switch K2 are connected with the driving coil L in series; the energy storage value of the first energy storage element C1 is 1.3 times larger than that of the second energy storage element C2.
Preferably, the fast energy storage element is a first energy storage element C1, the fast control switch is a first control switch K1, and the first energy storage element C1 and the first control switch K1 are connected in series with a portion of the driving coil L; the constant-speed energy storage element is a second energy storage element C2, the constant-speed control switch is a second control switch K2, and the second energy storage element C2 and the second control switch K2 are connected with the driving coil L in series; the energy storage value of the first energy storage element C1 is greater than 1.3 times the energy storage value of the second energy storage element C2.
Preferably, the fast energy storage element is a first energy storage element C1, the fast control switch is a first control switch K1, and the first energy storage element C1 and the first control switch K1 are connected in series with a portion of the driving coil L; the constant-speed energy storage element is a second energy storage element C2, the constant-speed control switch is a second control switch K2, and the second energy storage element C2, the second control switch K2 and the current-limiting resistor R are connected with the driving coil L in series; the energy storage value of the first energy storage element C1 is greater than 1.3 times the energy storage value of the second energy storage element C2.
Preferably, the energy storage element has a storage value of CU 2 And/2, wherein C is the capacitance value of the energy storage element, and U is the voltage value of the energy storage element.
Preferably, the drive mechanism comprises at least one of: repulsion mechanism, electromagnetic mechanism, elastic mechanism.
Preferably, the manner of maintaining the opening/closing state of the driving mechanism includes at least one of: magnetic holding, elastic element holding, and mechanical latching holding.
Preferably, the control circuit comprises at least one of: silicon controlled rectifier, insulated Gate Bipolar Transistor (IGBT for short), relay, and electromagnetic switch.
Preferably, the fast energy storage element and the constant speed energy storage element each comprise at least one of: a capacitor and a battery.
In the embodiment of the invention, the control circuit in the switch controls the current flowing through the driving coil of the driving mechanism and the change rate thereof according to different operation conditions of the circuit, so that the switch component executes the opening action and the closing action (opening and closing action) of the circuit at the most appropriate speed, namely, the combination of the rapid opening and closing action and the normal-speed opening and closing action is realized. Because the number of rapid opening and closing actions is reduced, the probability of fatigue damage is reduced, and the service life and the safety of the switch are ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a switch according to an embodiment of the present invention;
FIG. 2 is a first schematic diagram of a control circuit according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of a control circuit according to an embodiment of the present invention; and
fig. 4 is a third schematic diagram of a control circuit according to an embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the invention provides a switch. Fig. 1 is a schematic diagram of a switch according to an embodiment of the present invention, as shown in fig. 1, including: the switching component 1 is used for executing the opening action and the closing action of the circuit when the circuit works normally or breaks down; a drive mechanism 2 including a drive coil for driving the operation of the switch unit 1; and a control circuit 3 including: the circuit comprises a quick energy storage element and a quick control switch, wherein the quick energy storage element and the quick control switch are both connected with a driving coil or a part of the driving coil in series, and the quick control switch controls the quick energy storage element to discharge the driving coil or the part of the driving coil when the circuit fails so as to control the current flowing through the driving coil or the part of the driving coil and the change rate of the current; the constant-speed energy storage element and the constant-speed control switch are connected with the driving coil or a part of the driving coil in series, the constant-speed control switch controls the constant-speed energy storage element to discharge the driving coil or the part of the driving coil when the circuit works normally so as to control the current flowing through the driving coil or the part of the driving coil and the change rate of the current, wherein the current flowing through the driving coil or the part of the driving coil when the circuit breaks down and the change rate of the current are larger than the current flowing through the driving coil or the part of the driving coil when the circuit works normally and the change rate of the current.
In the related art, the electromagnetic repulsion mechanism of the quick switch has high opening and closing movement strength, so that fatigue damage is caused during long-time use, and the service life and safety of the quick switch are reduced. In the embodiment of the invention, the control circuit 3 controls the current flowing through the driving coil of the driving mechanism 2 and the change rate thereof according to different operating conditions of the circuit, so that the switching component 1 executes the switching-off action and the switching-on action (switching-off and switching-on actions) of the circuit at the most appropriate speed, namely, the combination of the rapid switching-on and switching-off action and the normal-speed switching-on and switching-off action is realized. Because the number of rapid opening and closing actions is reduced, the probability of fatigue damage is reduced, and the service life and the safety of the switch are ensured.
In the present embodiment, the switch assembly 1 comprises a vacuum interrupter (shown shaded), a stationary contact 11 and a movable contact 12. The moving contact 12 is connected with the driving mechanism 2 and is used for being disconnected or contacted with the static contact 11 under the driving of the driving mechanism 2, so that the opening and closing actions of the circuit are realized.
In the present embodiment, the driving mechanism 2 may be one or more of a repulsive force mechanism, an electromagnetic mechanism, and an elastic mechanism.
In this embodiment, the manner of holding the switching-on/off state may be one or more of magnetic holding, elastic element holding, and mechanism latch holding.
In the present embodiment, the control switch 3 may be one or more of a thyristor, an IGBT, a relay, and an electromagnetic switch.
The following describes in detail the implementation of the above-described embodiment of the present invention with reference to the drawings. In order to clearly distinguish the rapid opening and closing operation from the normal-speed opening and closing operation, reference numerals are defined as follows.
(1) And marking the quick energy storage element for quick opening and closing actions as C1.
(2) And a constant-speed energy storage element for constant-speed opening and closing actions is marked as C2.
(3) The fast control switch for fast opening and closing action is marked as K1.
(4) The constant speed control switch for the constant speed opening and closing operation is marked as K2.
(5) The current limiting resistor for the constant speed opening and closing action is marked as R.
Example 1
This example 1 involves discharging the energy storage elements connected in parallel to the respective drive coils. Specifically, a fast control switch and a fast energy storage element for fast opening and closing operations are connected to the drive coil, and a normal speed control switch and a normal speed energy storage element for normal speed opening and closing operations are connected to the drive coil.
Fig. 2 is a first schematic diagram of a control circuit according to an embodiment of the invention. As shown in fig. 2, the first energy storage element C1 and the first control switch K1 are connected in series with the driving coil L, wherein the first energy storage element C1 is a fast energy storage element, and the first control switch K1 is a fast control switch; the second energy storage element C2 and the second control switch K2 are connected in series with the driving coil L, wherein the second energy storage element C2 is a constant-speed energy storage element, and the second control switch K2 is a constant-speed control switch. Wherein the energy storage value of the first energy storage element C1 is greater than 1.3 times the energy storage value of the second energy storage element C2.
In the present example 1, when the circuit is out of order and a rapid opening and closing operation is required, the first energy storage element C1 discharges the driving coil L of the driving mechanism 2, and a current as large as possible is input or a current change rate as large as possible is provided, so as to drive the switching assembly 1 to perform the rapid opening and closing operation of the circuit. When the circuit works normally and normal-speed opening and closing actions can be adopted, the second energy storage element C2 discharges the driving coil L of the driving mechanism 2, and a small current is input into the driving coil or a small current change rate is provided, wherein the current is smaller than the current required by the rapid opening and closing actions and the change rate thereof, so that the switching component 1 is driven to execute the normal-speed opening and closing actions of the circuit.
In the present example 1, the energy storage values of the first energy storage element C1 and the second energy storage element C2 preferably satisfy the following numerical relationship: the energy storage value of the first energy storage element C1 is 1.3 times larger than that of the second energy storage element C2, so that the rapid brake opening speed is improved. Wherein the energy storage value of the energy storage element is CU 2 The capacitance value of the energy storage element is/2,C, and U is the voltage value of the energy storage element.
Example 2
This example 2 involves discharging the energy storage elements connected in parallel to the respective drive coils. Specifically, a quick control switch and a quick energy storage element for quick opening and closing operations are connected to a part of the coils of the drive coil, and a constant speed control switch and a constant speed energy storage element for constant speed opening and closing operations are connected to the drive coil.
FIG. 3 is a second schematic diagram of a control circuit according to an embodiment of the invention. As shown in fig. 3, the first energy storage element C1, the first control switch K1 and a part of the coil of the driving coil L are connected in series, wherein the first energy storage element C1 is a fast energy storage element, and the first control switch K1 is a fast control switch; the second energy storage element C2 and the second control switch K2 are connected in series with the driving coil L, wherein the second energy storage element C2 is a constant-speed energy storage element, and the second control switch K2 is a constant-speed control switch. Wherein the energy storage value of the first energy storage element C1 is greater than 1.3 times the energy storage value of the second energy storage element C2.
In this example 2, when the circuit is out of order and a rapid opening and closing operation is required, the first energy storage element C1 is discharged to a portion of the driving coil L of the driving mechanism 2, and a current as large as possible is input or a current change rate as large as possible is provided, so that the switching assembly 1 is driven to perform the rapid opening and closing operation of the circuit. When the circuit works normally and can adopt a constant-speed opening and closing action, the second energy storage element C2 discharges the driving coil L of the driving mechanism 2, and a small current is input into the driving coil or a small current change rate is provided, wherein the current is smaller than the current required by the rapid opening and closing action and the change rate thereof, so that the switching component 1 is driven to execute the constant-speed opening and closing action of the circuit.
In the present example 2, the energy storage values of the first energy storage element C1 and the second energy storage element C2 preferably satisfy the following numerical relationship: the energy storage value of the first energy storage element C1 is 1.3 times larger than that of the second energy storage element C2, so that the rapid brake opening speed is improved. Wherein the energy storage value of the energy storage element is CU 2 The capacitance value of the energy storage element is/2,C, and U is the voltage value of the energy storage element.
Example 3
This example 3 involves discharging the parallel energy storage elements to the drive coil. Specifically, a quick control switch and a quick energy storage element for quick opening and closing operations are connected to a part of the coils of the drive coil, and a constant speed control switch, a constant speed energy storage element and a current limiting resistor for constant speed opening and closing operations are connected to the drive coil.
Fig. 4 is a third schematic diagram of a control circuit according to an embodiment of the invention. As shown in fig. 4, the first energy storage element C1, the first control switch K1 and a part of the coil of the driving coil L are connected in series, wherein the first energy storage element C1 is a fast energy storage element, and the first control switch K1 is a fast control switch; the second energy storage element C2, the second control switch K2, the current limiting resistor R and the driving coil L are connected in series, wherein the second energy storage element C2 is a constant-speed energy storage element, and the second control switch K2 is a constant-speed control switch. Wherein the energy storage value of the first energy storage element C1 is greater than 1.3 times the energy storage value of the second energy storage element C2.
In this example 3, when the circuit is out of order and a rapid opening and closing operation is required, the first energy storage element C1 discharges a part of the coils of the driving coil L of the driving mechanism 2, and a current as large as possible is input or a current change rate as large as possible is provided, so that the switching assembly 1 is driven to perform the rapid opening and closing operation of the circuit. When the circuit works normally and can adopt a constant-speed opening and closing action, the second energy storage element C2 discharges to the driving coil L of the driving mechanism 2 through the current limiting resistor R, and a small current is input to the driving coil or a small current change rate is provided, wherein the current is smaller than the current required by the rapid opening and closing action and the change rate thereof, so that the switch component 1 is driven to execute the constant-speed opening and closing action of the circuit.
In the present example 3, the energy storage values of the first energy storage element C1 and the second energy storage element C2 preferably satisfy the following numerical relationship: the energy storage value of the first energy storage element C1 is 1.3 times larger than that of the second energy storage element C2, so that the rapid brake opening speed is improved. Wherein the energy storage value of the energy storage element is CU 2 The capacitance value of the energy storage element is/2,C, and U is the voltage value of the energy storage element.
In summary, according to the above embodiments of the present invention, a switch is provided. The switch includes: the switching component is used for executing the opening action and the closing action of the circuit when the circuit works normally or breaks down; a drive mechanism including a drive coil for driving the operation of the switch assembly; and a control circuit comprising: the circuit comprises a quick energy storage element and a quick control switch, wherein the quick energy storage element and the quick control switch are both connected with a driving coil or a part of the driving coil in series, and the quick control switch controls the quick energy storage element to discharge the driving coil or the part of the driving coil when the circuit fails so as to control the current flowing through the driving coil or the part of the driving coil and the change rate of the current; the constant-speed control switch controls the constant-speed energy storage element to discharge the driving coil or the part of the driving coil when the circuit works normally so as to control the current flowing through the driving coil or the part of the driving coil and the change rate of the current flowing through the driving coil or the part of the driving coil when the circuit breaks down, wherein the current flowing through the driving coil or the part of the driving coil and the change rate of the current are larger than the current flowing through the driving coil or the part of the driving coil when the circuit works normally and the change rate of the current. According to different operation conditions of the circuit, the control circuit 3 in the switch controls the current flowing through the driving coil of the driving mechanism 2 and the change rate thereof, so that the switch assembly 1 executes the opening action and the closing action (opening and closing action) of the circuit at the most appropriate speed, namely, the combination of the rapid opening and closing action and the normal-speed opening and closing action is realized. Because the number of rapid opening and closing actions is reduced, the probability of fatigue damage is reduced, and the service life and the safety of the switch are ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A switch, comprising:
the switching component is used for executing the opening action and the closing action of the circuit when the circuit works normally or breaks down;
a drive mechanism including a drive coil (L) for driving the operation of the switch assembly; and
a control circuit, comprising:
a fast energy-storing element and a fast control switch connected in series, in the first control branch
For operating the drive coil (L) in the event of a failure of the circuit
Discharging to control the current flowing through the drive coil (L) and its rate of change,
the rapid switching-off action and the rapid switching-on action are realized; wherein the rapid energy storage element
Is a first energy storage element (C1), and the fast control switch is a first control switch
(K1) The first energy storage element (C1), the first control switch (K1)
In series with a portion of the drive coil (L);
a constant-speed energy storage element and a constant-speed control switch which are connected in series, and are arranged in a second control branch which is connected with the first control branch in parallel and used for discharging the driving coil (L) when the circuit works normally so as to control the current flowing through the driving coil
(L) the current and the change rate thereof realize the constant-speed opening and closing actions;
wherein the constant-speed energy storage element is a second energy storage element (C2), and the constant speed is
The control switch is a second control switch (K2), and the second energy storage element (C2),
The second control switch (K2) is connected in series with the drive coil (L);
wherein the current and its rate of change when the circuit fails are greater than the current and its rate of change when the circuit is operating normally.
2. The switch of claim 1,
the energy storage value of the first energy storage element (C1) is greater than 1.3 times the energy storage value of the second energy storage element (C2).
3. The switch according to claim 1, further comprising a current limiting resistor (R) connected in series with said second energy storage element (C2), said second control switch (K2), and said drive coil (L);
the energy storage value of the first energy storage element (C1) is greater than 1.3 times the energy storage value of the second energy storage element (C2).
4. A switch according to any of claims 1 to 3, characterized in that the energy storage of the energy storage element is CU 2 And/2, wherein C is the capacitance value of the energy storage element, and U is the voltage value of the energy storage element.
5. The switch of any one of claims 1 to 3, wherein the drive mechanism comprises at least one of: repulsion mechanism, electromagnetic mechanism, elastic mechanism.
6. A switch according to any one of claims 1 to 3, wherein the manner of maintaining the on/off state of the drive mechanism comprises at least one of: magnetic holding, elastic element holding, and mechanical latching holding.
7. The switch of any one of claims 1 to 3, wherein the control circuit comprises at least one of: silicon controlled rectifier, insulated gate bipolar transistor IGBT, relay, electromagnetic switch.
8. The switch of any one of claims 1 to 3, wherein the fast energy storage element and the constant speed energy storage element each comprise at least one of: a capacitor and a battery.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664438 | 2020-07-10 | ||
| CN2020106644385 | 2020-07-10 | ||
| CN2020214442041 | 2020-07-21 | ||
| CN202021444204 | 2020-07-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112490067A CN112490067A (en) | 2021-03-12 |
| CN112490067B true CN112490067B (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011312891.6A Active CN112349525B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011308533.8A Active CN112490065B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011312893.5A Active CN112490037B (en) | 2020-07-10 | 2020-11-20 | Switch and control method thereof |
| CN202011312898.8A Active CN112490067B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011308458.5A Active CN112490064B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011308551.6A Active CN112490066B (en) | 2020-07-10 | 2020-11-20 | Switch |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011312891.6A Active CN112349525B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011308533.8A Active CN112490065B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011312893.5A Active CN112490037B (en) | 2020-07-10 | 2020-11-20 | Switch and control method thereof |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011308458.5A Active CN112490064B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011308551.6A Active CN112490066B (en) | 2020-07-10 | 2020-11-20 | Switch |
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| CN116092845B (en) * | 2023-04-03 | 2023-06-16 | 宁波天安智能电网科技股份有限公司 | Series digital double-break high-voltage switch device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112490037B (en) | 2023-02-28 |
| CN112490066A (en) | 2021-03-12 |
| CN112349525A (en) | 2021-02-09 |
| CN112490065A (en) | 2021-03-12 |
| CN112490067A (en) | 2021-03-12 |
| CN112349525B (en) | 2023-07-25 |
| CN112490064B (en) | 2023-09-05 |
| CN112490066B (en) | 2023-03-10 |
| CN112490065B (en) | 2023-05-30 |
| CN112490064A (en) | 2021-03-12 |
| CN112490037A (en) | 2021-03-12 |
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